Elevated railway



(No Model.) 3 Sheets-Sheet 1'. W. B. MACK.

ELEVATED RAILWAY. No. 340,337. Patented Apr. 20,1886.

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(No Model.) 3 3 Sheets-Sheet 2.

W. B. MACK.

ELEVATED RAILWAY. No. 340,337. Patented Apr. 20,1886.

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(No Model.) 3 Sheets-Sheet 3.

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ELEVATED RAILWAY.

No. 340,337. Patented Apr. 20, 18 86.

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W I V 'UNTTED STaTns I PATENT tries.

\VILLIAM B. MACK, OF BOSTON, MASSACHUSETTS.

ELEVATED RAILWAY.

SPECIFICATION forming part of Letters Patent No. 340,337, dated April20, 1886.

Application filed February 17, lESG. Serial No. 191,169. (No model.)

To aZZ whom it may concern:

Boston, in the county of Suffolk and State of Massachusetts, haveinvented certain new and useful Improvements in Elevated Railways, ofwhich the following is a specification.

My invention relates to railroads, and more especially to what are knownas elevated railroads, and has forits object the construction of such aroad which shall be firm, safe, and easily traversed by cars or trucks,and one on which electricity may be readily employed as a motor.

To the foregoing ends my invention consists in two tracks or ways ofthree rails each, one way constructed on each side of a street, withgirders and braces connecting and supporting the two ways atsubstantially regular intervals, two rails of each way being arrangedsomewhat as usual, and the third at a lower plane.

My invention also consists in the details of construction of a road ofthe character mentioned, all as hereinafter described, and subsequentlypointed out in the claims.

1n the drawings hereto annexed, and forming a part of thisspecification, Figure 1 represents a cross-sectional elevation of myimproved elevated railway. Fig. 2 is a side elevation of the same; andFig. 3 is a View similar to Fig. 1, representing a modification.

The same letters of reference indicate corresponding parts in all thefigures.

a a represent pillars erected at substantially regular intervals along,and in this instance presumed to be on each side of a street. Saidpillars are provided on their upper ends with braces or brackets b b,which support pillars c 0, upon the upper ends of which rails d daremounted, and to which they are secured.

On substantially the upper ends of the pillars a a, and midway betweenthe rails d d, but at a much lower plane, are mounted and secured therails e e. This arrangement of rails is adapted to a car-truck of theconstruction discovered in the application for Letters Patent filed byme on the 1st day of February, 1886.

Pillars a a are connected and supported by girders f, extending from theouter braces or brackets on the post on one side of the street to thecorresponding braces or brackets on the opposite post, to which bracesor brackets they are properly secured, as they are in like mannersecured to the base of the outer supporting-pillars, 0 0. Anothergirder, 9, 6X- tends from the upper ends of the outersupporting-pillars, c, of one track to the same point of the oppositesupporting-pillars of the other track, to which pillars the said girderg is suitably secured. Braces z z are arranged between girders fand g,as shown, to insure their firmness as supports for said pillars, and.

as means for binding the two girders together.

Extending downwardly and inwardly toward rail e from the tops of thepillars c c are braces 7.], which still further serve to support andmaintain in proper positions pillars c c and the rails mounted thereon.

A properly-constructed road-bed, k k, supported by pillars c a and theirbraces or brackets b I), extends between such pillars of each road, asshown in Fig. 2.

By the arrangement shown and described I am enabled to construct a firmand entirely safe road adapted to the use of the truck described in myaforesaid application. and to make it entirely feasible to employelectricity as a motor on elevated roads, since the wheel of thecar-truck traversing the rail 0 is calculated in an eminent degree to bemade the driving-wheel of the car, and said rail 6 can readily beinsulated from all parts of the roadbed, as will be understood byreference to Fig. 1 of the drawings.

Another advantage of my construction is, that elevated roads as nowbuilt, in which parallel tracks are strengthened and supported bycross-girders, can, with slight expense and without weakeningtheirstructure, be changed and adapted to my system and arrangement bymerely removing the portions of the girders fand 9, extending betweenpillars c c of the same track, laying a rail in the middle of theroad-bed on the tops of pillars a a, similar to rail 6, as herein shownand described, and arranging and securing the braces j j as setforthherein.

In Fig. 3 I have shown modified means for supporting the road-bed. Inthis construction the supporting-pillars a are tubular in form, incontradistinction to the square or I-shaped beams a. (Represented inFigs. 1 and 2.) Brackets b are constructed with sockets If in theirbases, in which the upper ends of pillars a enter, and by which meansbrackets b are supported. Sockets b b b are also formed in the upperportions of said brackets, in which the lower ends of pillars 1 2 3rest, said pillars being in a line directly underneath the means forsupporting rails d e d, as shown. By this modified construction asomewhat stronger and firmer bed is formed than by that represented inFigs. 1 and 2.

Having thus described my invention, I clain1 1. An elevated railroad oftwo substantially parallel tracks, each track supported on a single lineof pillars, a a, and consisting of three rails, two arranged on pillarsor posts parallel to each other, as usual, and a third arranged at alower horizontal plane between the two first mentioned, the two tracksbeing bound together at substantially regular intervals by girders andbraces, and the pillars supporting a lower horizontal plane, bracesjj,extending from the top of pillars c c to the road-bed to or near therail 0, and girders fg and their braces t i, as set forth.

In testimony whereof Ihave signed my name to this specification, in thepresence of two subscribing witnesses, this 28th day of January, 1886.

\VILLIAM B. MACK. \Vitnesses:

A. R. XVooDRoN, EDWARD S. Ross.

